Master Lock Universal Coupler Lock, Fits 1-7/8" & 2" - MA 377KA/0313
The Master Lock No. 377KA features a trailer coupler lock, designed to fit 1-7/8in (48mm), 2in (51mm) and most 2-5/16in (59mm) trailer couplers. The advanced locking mechanism provides resistance to picking and prying. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.